Furnace.



F. H. O. MEY.

FURNACE.

APPLICATION FILED SEPT. 28, 190B.

Patented Aug. 24. 1909.

2 SHEETS-SHEET 1.

Jkbrnqys F. H. O. MEY.

FURNACE.

APPLIOATIOH FILED SEPT. 2a, 1908.

932,044. Patented Aug. 24, 1909.

2 SHEETS-SHEET 2.

m%nesse sd 171.116 71%) @FFICFL.

FREDERICK H. G. HEY, OF BUFFALO, NEVT YORK.

FURNACE Specification of Letters Patent.

Patented Aug. 2%, 19b9- Application filed September 28, 1908. erial No. 55,104.

To all whom it may concern:

Be it known that I,Fanonmox H. C. Muir, a citizen of the United States, residing at Buffalo, in the county of Erie and EBtate of New York, have invented a new and useful Improvement in Furnaces, of which the following is a specification.

' This invention relates to a heater or furnace designed moreespecially for supplying hot air to pneumatic malting and drying apparatus, but the same is also useful in connection with other apparatus of various kinds requiring a hot-air supply of a given or variable temperature.

A malting apparatus in connection With which my invention is particularly desirable is shown in Letters Patent of the United States No. 857,954, granted to me June 25, 1907. That apparatus comprises a battery or plurality of melting drums and three air supply trunks connected with each of the drums, one of the trunks being connected with the atmosphere and supplying dry cool air to the drums during the steeping process of the grain, the second trunk furnishing moist air of the proper temperature during the germinating stage of the inalting process, and the third trunk being connected with a furnace and supplying dry hot air for drying the malt. in this apparatus, the temperature required during the germinating stage is maintained by properly commingling the hot and cold air from the corresponding trunks before delivering it into the drums, this being done by separate valves or dampers in said trunks.

The objectof my present invention is the provision of an improved furnace by which the mixture of hot and cold air necessary to 4 produce the required temperature can be effected within the furnace itself instead of the air-trunks outside thereof, thus simplifying the construction of the valved air trunks and permitting a more convenient and satisfactory regulation of the temperature.

in the accompanying drawings consisting of 2 sheets: Figure 1 is a side elevation of the furnace. Fig. 2 is a vertical longitudinal section thereof. Fig. 3 is a front elevation of the same. Fig. 4 is a transverse section in line M, Fig. 1.

Similar letters of reference indicate corresponding parts in the several views.

A indicates the combustion chamber of the furnace, B the grate, C the fuel doors and D the ash pit doors, all of which parts I i l I l may be of any ordinary or well-known construction.

The combustion chamber opens at its rear end into a mixing chamber E extending practically from top to bottom of the furnace and throughout the width of the combustion chamber, and F indicates an air pipe leading from the top of the mixing chamber to the apparatus, not shown, which is to be supplied with hot air. When the furnace is used in connection with a malting apparatus of the kind hereinbefore refered to, the pipe F is connected with the eye of the usual Ian which forces the air into and through the melting drums. The hot air supply pipe F contains a sliding or other suitable damper f.

Above the combustion chamber is arranged a longitudinal cold air flue or pas sage G which preferably extends from the front end of the furnace to the mixing chamber E for supplying dry cold air to the latter. This hue extends through the front wall of the furnace, as shown, so as to communicate freely with the outer air.

H indicates the smoke stack of the furnace which, in the construction shown, extends from the top of the same through the cold air line To the rear ends of the combustion chamber and the cold air flue is applied a valve, gate or slide 1 by which communication between either of the same and the mixing chamber E may be cut off more or less, or altogether, for supplying the proper volur e of cold air to the mixing chamber to obtain hot air of the desired temperature. In the preferred construction shown in the drawings, the valve consists of a vertically movable slide arranged at its lateral edges in upright guides j secured to the front wall of the mixing chamber E at opposite sides of the combustion chamber and the cold air flue I and made of such a length from top to bottom that when raised to its upper limit, it completely closes the rear end of the cold air flue and fully uncovers the rear end of the combustion chamber, as shown in Fig. and by full lines in Fig. 4-, thus supplying hot air of the maximum temperature; while when the slide is lowered to its limit, it fully closes the rear end of the combustion chamber and completely opens the corresponding end of th cold air flue. shifted to an intermediate position, as shown by dotted lines in Fig. l, it uncovers the rear hen the slide is ends of both the combustion chamber ani. the cold air flue more or less, thus commingling a greater or less volume of cold air with the hot air entering the mixing chamber and accordingly reducing and regulating the temperature of the air supplied to the malting drums or other apparatus.

Any suitable means may be employed for operating the slide 1. 1n the construction shown, it is provided for this purpose with gear racks K which are en aged by pinions L secured to a horizontal shaft M a ranged transversely in the mixing chamber One end of this shaft extends through the wall of the furnace and carries a hand wheel m for turning it, and a ratchet wheel a engaged by a detent pawl 0 for preventing backward rotation of the shaft and retaining the slide in position.

The mixing chamber is preferably provided at one side with a door 1) through which lL may be entered for cleaning it from timeto time.

As the tempering of the hot air from the combustion chamber is effected by adjusting a single slide 01' valve in the furnace, this is done more conveniently and more accurately than with a structure recpiiring two valves to be separately adjusted.

I claim as my invention 1. In a furnace, the combination of the combustion chamber, a mixing chamber communicating with the combustion chamber, a cold air line also connected with said mixing chamber, and a single valve applied to the rear portions of said combustion chamber and said cold air fine and constructed to open communication more or less between the mixing chamber and the cold air flue when communication between the combustion chamber and the mixing chamber is partly cut off, or vice versa.

2. In a furnace, the combination of a combustion chamber, a mixing chamber arranged in rear thereof and communicating therewith, a cold air flue arranged above the combustion chamber and communicating at its rear end with the mixing chamber, a

a shaft arranged transversely in the mixing chamber and provided with a gear pinion engaging said rack.

In a furnace, the combination of a-combustion chamber, a mixing chamber arranged in rear thereof and communicating therewith, a cold air flue arranged above the combustion chamber and communicating at its rear end with the mixing chamber, upright guides applied to the front wall of the mixing chamber, a slide arranged in said guide and controlling communication between the mixing chaml and combustion chamber and cold air tine and provided on its rear side with a gear rack, and a shaft arranged transversely in the mixing chamber and having a gear pinion engaging said gear rac itness my hand this 25t tember, 1908.

FREDERICK H. C. MEY.

11 day of SeplVitnesses C. F. GEYER, E. Id. GRAHAM. 

